old css

#tabbrowser-tabs {
    visibility: collapse;
}
#navigator-toolbox {
    display: flex;
    flex-direction: row;
    flex-wrap: wrap;
}
#titlebar {
    order: 1;
    max-width: 146px;
}
#titlebar #TabsToolbar {
    background-color: var(--toolbar-bgcolor);
    background-image: var(--toolbar-bgimage)
}
#titlebar #TabsToolbar .titlebar-spacer {
    background-color: rgba(0,0,0,0.05);
    margin: 3px;
    border-radius: 25%;
    cursor: grab;
}
#titlebar #TabsToolbar .titlebar-spacer[type="pre-tabs"] {
    display: none;
}
#nav-bar {
    order: 0;
    width: calc(100% - 146px);
}
#PersonalToolbar {
    order: 2;
}
/* Update - Hides the new Firefox home + tab dropdown. */
#TabsToolbar .toolbar-items {
  display: none;
}

/* This next one hides Tree Style Tab header */
#sidebar-header {
  display: none;
}